<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        table {
            border: 1px solid #ddd;
            margin: 100px auto;
        }
        th,td {
            width:600px;
           border: 1px solid #ccc; 
           text-align: center;
        }
    </style>
</head>
<body>
    <div id="app">
        <table>
            <caption>欢迎光临_vue开发的收银系统_水果店</caption>
            <tr>
                <th>苹果 10 ￥ / 斤，折扣  &lt;8折&gt; </th>
            </tr>
            <tr>
                <td>请输入你要购买的斤数 <input type="number" v-model="count"> </td>
            </tr>
            <tr>
                <td><button @click="order">结账买单~</button> </td>
            </tr>
            <tr>
                <td>结账单：总价：{{ total }}￥元 折后价：{{ total * .8 }} ￥元  省了：{{ total * .2 }} ￥元 </td>
            </tr>
        </table>
    </div>

    <script src="./vue.js"></script>
    <script>
        new Vue({
            el: '#app',
            data() {
                return {
                    count: 0,
                    total: 0
                }
            },
            methods: {
                order () {
                    // 算出总价
                    this.total =  this.count * 10
                }
            }
        })
    </script>
</body>
</html>